Image forming apparatus that improves contact member durability and suppresses occurrence of cleaning failure
An image forming apparatus includes an intermediate transfer member. The intermediate transfer member includes a layer made of an acrylic copolymer. A plurality of grooves is formed in the layer along a moving direction of the intermediate transfer member across a width direction of the intermediate transfer member. A groove distance that is an average distance between adjoining grooves of the plurality of grooves in the width direction of the intermediate transfer member is 2 μm or more and 10 μm or less.
1. An image forming apparatus comprising:
an image bearing member configured to bear a toner image;
a movable intermediate transfer member configured to contact with the image bearing member, the toner image borne on the image bearing member being primarily transferred to the intermediate transfer member; and
a collection unit, arranged downstream of a secondary transfer portion with respect to a moving direction of the intermediate transfer member, the secondary transfer portion being configured to secondarily transfer the toner image primarily transferred to the intermediate transfer member, from the intermediate transfer member to a transfer material, the collection unit including a blade configured to contact with the intermediate transfer member by a free end of the blade, the collection unit being configured to collect toner remaining on the intermediate transfer member having passed through the secondary transfer portion by using the blade,
wherein the intermediate transfer member includes a base layer that is a thickest layer among a plurality of layers constituting the intermediate transfer member in a thickness direction of the intermediate transfer member and a surface layer formed on a surface of the base layer and configured to contact with the image bearing member and the blade, and
wherein the surface layer is made of an acrylic copolymer, the surface layer including a plurality of grooves recessed relative to a flat portion of the surface layer and a plurality of protrusions protruding relative to the flat portion of the surface layer,
wherein the plurality of grooves are formed along the moving direction of the intermediate transfer member in a width direction of the intermediate transfer member, the width direction intersecting the moving direction,
wherein an average distance between adjacent grooves of the plurality of grooves in the width direction is 2 μm or more and 7 μm or less, and
wherein each groove of the plurality of grooves transitions into a protrusion of the plurality of protrusions.
2. The image forming apparatus according to claim 1 , wherein the blade is configured to contact with the intermediate transfer member in a state that the free end of the blade is extended from a downstream side toward an upstream side with respect to the moving direction of the intermediate transfer member.
3. The image forming apparatus according to claim 1 , wherein an ion conductive agent is added to the base layer.
4. The image forming apparatus according to claim 1 , wherein the surface layer has a thickness of 1 μm or more and 5 μm or less.
5. The image forming apparatus according to claim 4 , wherein the thickness of the surface layer is 3 μm or less.
6. The image forming apparatus according to claim 1 , wherein a solid lubricant is added to the surface layer.
7. The image forming apparatus according to claim 6 , wherein the solid lubricant is a fluorine-containing particle.
8. The image forming apparatus according to claim 7 , wherein the fluorine-containing particle is polytetrafluoroethylene (PTFE).
9. The image forming apparatus according to claim 1 , wherein a solid lubricant is added to the outer peripheral surface of the intermediate transfer member which makes contact with the image bearing member and the blade.
10. The image forming apparatus according to claim 1 , wherein the plurality of grooves have an opening width of 0.5 μm or more and 3 μm or less in the width direction of the intermediate transfer member, the width direction being orthogonal to the moving direction.
11. The image forming apparatus according to claim 10 ,
wherein the opening width of the plurality of grooves is a distance between peaks of protrusions of the plurality of protrusions that are adjacent to each respective groove of the plurality of grooves.
12. The image forming apparatus according to claim 1 , wherein the plurality of grooves is formed at equal distances.
13. The image forming apparatus according to claim 1 , wherein the plurality of grooves are formed along the moving direction at a predetermined angle with respect to the width direction.
14. The image forming apparatus according to claim 1 , wherein the blade is made of polyurethane.
15. The image forming apparatus according to claim 1 , wherein the blade has a rubber hardness of 70° or more and 80° or less with respect to Japanese Industrial Standard K 6253.
16. The image forming apparatus according to claim 1 , wherein a contact pressure of the free end of the blade with the intermediate transfer member is 0.4 N/cm or more and 0.8 N/cm or less.